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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Sistema inteligente para la predicción del tipo y cantidad de recursos óptimos en la planificación de proyectos en una empresa de electromecánica usando redes neuronales / Intelligent system for predicting the optimal type and number of resources in project planning in an electromechanical company using neural networks

Farfán Armas, Gabriel André, Morales Alba, Lincoln Jeampier 15 December 2021 (has links)
El presente documento de tesis tiene como finalidad presentar la planificación de la gestión, desarrollo y entregables de un proyecto de sistemas para una empresa dedicada a brindar servicios electromecánicos. Esto con el fin de automatizar sus procesos y obtener un beneficio en la operativa y actividades manuales. El proyecto está centrado en el proceso de planificación de cotizaciones de los proyectos operativos de la empresa. El documento está compuesto por 6 capítulos. El primer capítulo menciona los conceptos generales del negocio de electromecánica que es el objeto de estudio y el análisis de la problemática de la empresa. Asimismo, se detallan los objetivos y beneficios esperados del proyecto. El segundo capítulo muestra el logro de los student outcomes que describe la metodología utilizada para la investigación del proyecto. El tercer capítulo presenta el marco teórico del proyecto que contiene los fundamentos teóricos del negocio, tendencias y tecnologías actuales. El cuarto capítulo especifica el modelo de negocio, con sus reglas, casos de uso y realización de casos de uso. Además, se detallan los requerimientos funcionales y no funcionales del sistema. Asimismo, se describen los casos de uso del sistema. También, muestra la arquitectura de software que tendrá la solución propuesta. El quinto capítulo presenta los resultados del proyecto. Por último, el sexto capítulo presenta puntos orientados a la gestión del proyecto, como el registro de interesados, diagrama de EDT, cronograma de ejecución detallado con las actividades realizadas y entregables, y las actas de aceptación firmadas por el cliente. / The purpose of this project report is to present the management planning, development, and deliverables of a systems project for a company dedicated to providing electromechanical services. This to automate their processes and obtain a benefit in the operational and manual activities. The project is focused on the quotation planning process of the company's operational projects. The document is composed of 6 chapters. The first chapter mentions the general concepts of the electromechanical business that is the object of the study and the analysis of the company's problems. It also details the objectives and expected benefits of the project. The second chapter shows the achievement of the student outcomes describing the methodology used for the research of the project. The third chapter presents the theoretical framework of the project that contains the theoretical foundations of the business, trends, and current technologies. The fourth chapter specifies the business model, with its rules, use cases and use case realization. In addition, the functional and non-functional requirements of the system are detailed. It also describes the use cases of the system. It also shows the software architecture of the proposed solution. The fifth chapter presents the results of the project. Finally, the sixth chapter presents points oriented to the project management, such as the stakeholders register, WBS diagram, detailed execution chronogram with the activities performed and deliverables, and the acceptance minutes signed by the client. / Tesis
12

Propuesta de vivienda modular sostenible mediante la utilización de paneles de quincha prefabricada para atención de las demandas de refugio en Sondorillo, Huancabamba, Piura / Proposal of sustainable modular housing through the use of prefabricated quincha panels to meet requests for shelter in Huancabamba, Piura

Chavez More, Jordys David, Cueva Sandillan, Jhon Julio 09 October 2020 (has links)
En el presente documento se propone el proceso constructivo de una Vivienda Modular en respuesta a la demanda de refugios por parte de la población afectada por el Fenómeno El Niño de Sondorillo, Huancabamba, Piura, mediante el uso de materiales como el bambú, carrizo y barro disponibles en la zona de estudio. Con el sistema modular propuesto se ha logrado ajustar a un plazo de 7 días para su ejecución mediante la sectorización acorde al número de cuadrillas y a los metrados para un área total de 41.00 𝑚2; así mismo, mediante la planificación de partidas en paralelo para incrementar su ejecución in situ, a través de los procesos constructivos propuestos para el proyecto. Además, se demuestra la factibilidad del proyecto por su baja inversión y ahorro a través del tiempo en comparación a otras propuestas de vivienda. Finalmente, se realizó una simulación en 4D con el programa Navisworks obteniéndose una visualización virtual de los procesos constructivos para una adecuada capacitación de la mano de obra del proyecto y un mayor entendimiento de los procesos de trabajo respecto a la programación previamente realizada. / This document proposes the construction process of a Modular Housing in response to the demand for shelters by the population affected by the El Niño phenomenon of Sondorillo, Huancabamba, Piura, through the use of materials such as bamboo, reed and mud available in the study area. With the proposed modular system, it has been possible to adjust to a period of 7 days for its execution through the sectorization according to the number of crews and the metrados for a total area of 41.00 𝑚2; likewise, by planning parallel items to increase their execution in situ, through the construction processes proposed for the project. In addition, the feasibility of the project is demonstrated by its low investment and savings over time compared to other housing proposals. Finally, a 4D simulation was carried out with the Navisworks program, obtaining a virtual visualization of the construction processes for an adequate training of the workforce of the project and a greater understanding of the work processes with respect to the previously performed programming. / Tesis
13

Nitrogen and Phosphorus Availability in Forests of Varying Ages in the Bartlett Experimental Forest White Mountains, New Hampshire

Ratliff, Tera Jean 06 August 2012 (has links)
No description available.
14

Quadratic power system modeling and simulation with application to voltage recovery and optimal allocation of VAr support

Stefopoulos, Georgios Konstantinos 02 July 2009 (has links)
The main objectives of this research are (a) to develop advanced simulation methods for voltage-recovery phenomena using improved, realistic system models and accurate solution techniques and (b) to develop methods for the mitigation of problems related to slow voltage recovery. Therefore, this work concentrates on the areas of voltage-recovery analysis in electric power systems, dynamic load modeling with emphasis on induction-motor models, dynamic simulation with emphasis on the numerical integration methods, and optimal allocation and operation of static and dynamic VAr resources. In the first part of this work, a general framework for power-system analysis is presented the main characteristics of which are (a) the utilization of full three-phase models and (b) the use of a "quadratized" mathematical formulation, which models the system under study as a set of mathematical equations of order no more than two. The modeling approach is essentially the same for steady-state, quasi-steady-state, and dynamic analysis. Furthermore, a new approach for time-domain transient simulation of electric power systems and dynamical systems, in general, is introduced in this research. The new methodology has been named quadratic integration method. The method is based on a numerical integration scheme that assumes that the system states vary quadraticaly within an integration time step. Accurate modeling and simulation of voltage-recovery phenomena allows the development of mitigation methodologies via the optimal allocation and operation of static and dynamic VAr resources over the planning horizon. This problem is solved with successive dynamic programming techniques with the following two innovations: (a) the states at each stage (candidate solutions) are obtained with static and dynamic (trajectory) sensitivity analysis and (b) each candidate solution is evaluated by considering the optimal operation of installed static and dynamic VAr sources utilizing concepts from the theory of applied optimal control and trajectory optimization.
15

Dynamic network resources optimization based on machine learning and cellular data mining / Optimisation dynamique des ressources des réseaux cellulaires basée sur des techniques d'analyse de données et des techniques d'apprentissage automatique

Hammami, Seif Eddine 20 September 2018 (has links)
Les traces réelles de réseaux cellulaires représentent une mine d’information utile pour améliorer les performances des réseaux. Des traces comme les CDRs (Call detail records) contiennent des informations horodatées sur toutes les interactions des utilisateurs avec le réseau sont exploitées dans cette thèse. Nous avons proposé des nouvelles approches dans l’étude et l’analyse des problématiques des réseaux de télécommunications, qui sont basé sur les traces réelles et des algorithmes d’apprentissage automatique. En effet, un outil global d’analyse de données, pour la classification automatique des stations de base, la prédiction de la charge de réseau et la gestion de la bande passante est proposé ainsi qu’un outil pour la détection automatique des anomalies de réseau. Ces outils ont été validés par des applications directes, et en utilisant différentes topologies de réseaux comme les réseaux WMN et les réseaux basés sur les drone-cells. Nous avons montré ainsi, qu’en utilisant des outils d’analyse de données avancés, il est possible d’optimiser dynamiquement les réseaux mobiles et améliorer la gestion de la bande passante. / Real datasets of mobile network traces contain valuable information about the network resources usage. These traces may be used to enhance and optimize the network performances. A real dataset of CDR (Call Detail Records) traces, that include spatio-temporal information about mobile users’ activities, are analyzed and exploited in this thesis. Given their large size and the fact that these are real-world datasets, information extracted from these datasets have intensively been used in our work to develop new algorithms that aim to revolutionize the infrastructure management mechanisms and optimize the usage of resource. We propose, in this thesis, a framework for network profiles classification, load prediction and dynamic network planning based on machine learning tools. We also propose a framework for network anomaly detection. These frameworks are validated using different network topologies such as wireless mesh networks (WMN) and drone-cell based networks. We show that using advanced data mining techniques, our frameworks are able to help network operators to manage and optimize dynamically their networks
16

Implantation du processus de soins en nutrition

Fratino, Adriana 01 1900 (has links)
Problématique : Au Québec, le Processus de soins en nutrition (PSN) est peu utilisé, les organisations appréhendent que l’implantation sera ardue mais sont motivées à procéder. Objectif : Accompagner deux services de nutrition clinique d’établissements de santé de la grande région de Montréal dans le déploiement du PSN et documenter les barrières et facteurs facilitants. Méthodologie : L’Hôpital du Sacré-Cœur de Montréal et le CSSS Champlain–Charles-Le Moyne ont été recrutés. La collecte de données fut réalisée via des séances d’accompagnement tout au long du déploiement du PSN. Une rencontre de bilan fut effectuée dans chaque milieu, avec les nutritionnistes et les chefs de service. Les données colligées sont qualitatives. Les échanges furent enregistrés et un cahier de bord complété. La synthèse a été rédigée selon un modèle de gestion de changement. Résultats : Au total, 18 séances d’accompagnement eurent lieu et cinq rencontres de bilan. Les principaux obstacles à la mise en œuvre du PSN sont en grande partie liés à l'engagement des nutritionnistes, à la formation et aux contraintes de temps. Les principaux facteurs facilitants sont les présentations d’histoires de cas accompagnées de discussion et le manuel de la Terminologie internationale de diététique et de nutrition (TIDN). Discussion : Notre système de santé est de plus en plus sujet à des changements et les dirigeants devront optimiser les ressources. L’International Confederation of Dietetic Associations a suggéré d’adopter, à l’échelle internationale, le PSN en tant que cadre pour la profession. Les stratégies d’implantation portant sur des principes de gestion du changement organisationnel faciliteront l’intégration de ces changements importants. L’expérience des deux milieux documentés sera éclairante pour les autres organisations désirant implanter le PSN. / Problem: In Quebec, the use of the Nutrition Care Process (NCP) is limited, organizations apprehend its implantation will be arduous but are motivated to proceed. Objective: To accompany two clinical nutrition services of health facilities in the greater Montreal area in the deployment of the NCP and document the barriers and facilitating factors. Methodology: The Hôpital du Sacré-Cœur de Montréal and the CSSS Champlain–Charles-Le Moyne were recruited. Data collection was accomplished through accompanying sessions throughout the deployment of the NCP. An end of project meeting was held in each area, with nutritionists and heads of departments. The data collected is qualitative. The exchanges were recorded and a logbook was completed. The synthesis was written using a change management model. Results: A total of 18 accompanying sessions were held and five end of project meetings were held. The main obstacles to the implementation of the NCP are largely related to the commitment of nutritionists, training and time constraints. The main facilitating factors are the presentations of case studies with discussion and the manual of the International Dietetics and Nutrition Terminology (IDNT). Discussion: Our health system is increasingly subject to change and leaders will need to optimize resources. The International Confederation of Dietetic Associations suggested adopting the NCP as an international framework for the profession. Implementation strategies for organizational change management principles will facilitate the integration of these important changes. The experience of the two documented environments will be enlightening for other organizations wishing to implement the NCP.
17

Topics In Modeling, Analysis And Optimisation Of Wireless Networks

Ramaiyan, Venkatesh 01 1900 (has links)
The work in this thesis is concerned with two complementary aspects of wireless networks research; performance analysis and resource optimization. The first part of the thesis focusses on the performance analysis of IEEE 802.11(e) wireless local area networks. We study the distributed coordination function (DCF) and the enhanced distributed channel access (EDCA) MAC of the IEEE 802.11(e) standard. We consider n IEEE 802.11(e) DCF (EDCA) nodes operating as a single cell; by single cell, we mean that every packet transmission can be heard by every other node. Packet loss is attributed only to simultaneous transmissions by the nodes (i.e., collisions). Using the well known decoupling approximation [19], we characterize the collision behaviour and the throughput performance of the WLAN with a set of fixed point equations involving the backoff parameters of the nodes. We observe that the fixed point equations can have multiple solutions, and in such cases, the system exhibits multistability and short-term unfairness of throughput. Also, the fixed point analysis fails to characterize the average system behaviour when the system has multiple solutions. We then obtain sufficient conditions (in terms of the backoff parameters of the nodes) under which the fixed point equations have a unique solution. For such cases, using simulations, we observe that the fixed point analysis predicts the long term time average throughput behaviour accurately. Then, using the fixed point analysis, we study throughput differentiation provided by the different backoff parameters, including minimum contention window (CWmin), persistence factor and arbitration interframe space (AIFS) of the IEEE 802.11e standard. Finally, we extend the above results to the case where the receiver supports physical layer capture. In the second part of the thesis, we study resource allocation and optimization problems for a variety of wireless network scenarios. For a dense wireless network, deployed over a small area and with a network average power constraint, we show that single cell operation (the channel supports only one successful transmission at any time) is throughput efficient in the asymptotic regime (in which the network average power is made large). We show that, for a realistic path loss model and a physical interference model (SINR based), the maximum aggregate bit rate among arbitrary transmitter-receiver pairs scales only as Θ(log(¯P)), where¯P is the network average power. Spatial reuse is ineffective and direct transmission between source destination pairs is the throughput optimal strategy. Then, operating the network with only a single successful transmission permitted at a time, and with CSMA being used to select the successful transmitter-receiver pair, we consider the situation in which there is stationary spatiotemporal channel fading. We study the optimal hop length (routing strategy) and power control (for a fading channel) that maximizes the network aggregate throughput for a given network power constraint. For a fixed transmission time scheme, we study the throughput maximizing schedule under homogeneous traffic and MAC assumptions. We also characterize the optimal operating point (hop length and power control) in terms of the network power constraint and the channel fade distribution. It is now well understood that in a multihop network, performance can be enhanced if, instead of just forwarding packets, the network nodes create output packets by judiciously combining their input packets, a strategy that is called “network coding.” For a two link slotted wireless network employing a network coding strategy and with fading channels, we study the optimal power control and optimal exploitation of network coding opportunities that minimizes the average power required to support a given arrival rate. We also study the optimal power-delay tradeoff for the network. Finally, we study a vehicular network problem, where vehicles are used as relays to transfer data between a pair of stationary source and destination nodes. The source node has a file to transfer to the destination node and we are interested in the delay minimizing schedule for the vehicular network. We characterize the average queueing delay (at the source node) and the average transit delay of the packets (at the relay vehicles) in terms of the vehicular speeds and their interarrival times, and study the asymptotically optimal tradeoff achievable between them.

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